A water main break today forced the evacuation of the 23rd Street N and R train station.Kristy Leibowitz

A view of the flooding from inside the station. (MTA)

A water main burst in the Flatiron District this morning — causing the evacuation of a subway station, authorities said.

The pipe broke at 10:45 a.m. at West 23rd Street and Broadway and caused major flooding in the area that extended into the 23rd Street N and R train station, said a spokesman for the FDNY.

All N, Q and R trains were suspended between Whitehall station and West 57th Street for most of the day. Around 6 pm tonight, the MTA restored service on the Q train and began running N trains on express tracks in Manhattan. R trains are being rerouted to F lines between 36th Street in Queens and Rockefeller Center, then runs along the D line to DeKalb Avenue.

The flooding also caused disruptions on the D and B lines. Those lines are mostly back to normal service.